Heating unit for use in melting and keeping hydrocolloid cartridges in liquid form



FIG. 1 is a front elevational view of the heating unit for use in melting and keeping hydrocolloid cartridges in liquid form showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof; and,

FIG. 5 is a top, front and right side perspective view thereof.

The rear and bottom of the design are flat and unornamented. 

The ornamental design for heating unit for use in melting and keeping hydrocolloid cartridges in liquid form, as shown and described. 